So, for 250g =0.551155655 lb would be 18,414 ft = 5,600m, about 4.6x
as long.

The reason for the discrepancy-- the diameter of AWG 40 is given as
3.145 mils or about 0.08mm. Square the ratio and we have the
difference accounted for.

Click to expand...

Or, to put it another way, how long is a piece of metal string? >

What with the differing vlues for density, the unknown thickness and weight
of enamelling, and what may or may not be a confusion somewhere between
radius and diameter, the room for error is large. The OP gives 0.17 mm as a
diameter, but yours might be a radius, given a figure of 0.08. I've no idea
which is right, but that half/double between the two values is suggestive.

What with the differing vlues for density, the unknown thickness and weight
of enamelling, and what may or may not be a confusion somewhere between
radius and diameter, the room for error is large.

Click to expand...

Copper wire... ALL copper wire is given as the gauge of the WIRE
part of the "wire". Not enamel or anything else.

Otherwise all current capacity declarations/calculations would be
off from maker to maker, when in fact they are merely adjusted for
factors related to insulation material and thickness and thermal
properties.

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